A top comment on that video puts it into perspective well. That whole setup can store the energy of a single AA battery.
He would be so much better off just charging a cheap battery. All the money wasted on pumps, wood, barrel, pipes....
He would be so much better off just charging a cheap battery. All the money wasted on pumps, wood, barrel, pipes....
This is one where they use solar to pump water to the roof, and then use the potential energy overnight: https://www.youtube.com/watch?v=CMR9z9Xr8GM